// let's say the following env vars are set:
// MY_APPY_ENV=staging
// MY_APP_KEY1=bar

var confParser = require('./confParser'),
    conf = confParser('MY_APP', './conf.example.js');
    
// conf.key1 === 'bar'
// conf.key2.subkey1 === 'foo'
// conf.key2.subkey2.subsubkey1 === 'foo'